Families sifted through waterlogged debris Sunday and stepped inside empty cabins at Camp Mystic, an all-girls summer camp ripped apart by flash floods that washed homes off their foundations and killed at least 78 people in central Texas.

Three days after devastating floods killed at least 66 across Central Texas, 11 campers and one counselor remain unaccounted for from Camp Mystic, officials said during a press conference. Rescue operations are ongoing along the Guadalupe River,

Texas Gov. Greg Abbott warned Sunday that additional rounds of heavy rains lasting into Tuesday could produce more life-threatening flooding.